t/test.sh: use /bin/pwd instead of just pwd.
t/test.sh: use /bin/pwd instead of just pwd.

$(pwd) seems to sometimes lie, because the shell uses the $PWD environment
variable.  If your PWD is a symlink, this can cause the test to fail since
bup figures out the path using a real call to getcwd().

Problem reported by Zenaan Harkness, though he never did acknowledge if this
fixes his problem :(

Signed-off-by: Avery Pennarun <e03ccfb89d416c4697ad6970ce86a92c1c28a78e@gmail.com>

apenwarr/bup,mhoeher/bup,ToxicFrog/bup,jbaber/bup,pombredanne/bup,gevaerts/bup,mhoeher/bup,tjanez/bup,jbaber/bup,mhoeher/bup,apenwarr/bup,ToxicFrog/bup,pombredanne/bup,pombredanne/bup,pombredanne/bup,apenwarr/bup,tjanez/bup,tjanez/bup,tjanez/bup,ToxicFrog/bup,gevaerts/bup,gevaerts/bup,jbaber/bup,pombredanne/bup,mhoeher/bup,tjanez/bup,ToxicFrog/bup,apenwarr/bup,tjanez/bup,mhoeher/bup,pombredanne/bup,jbaber/bup,jbaber/bup,gevaerts/bup,jbaber/bup,gevaerts/bup,ToxicFrog/bup,mhoeher/bup